RFR: 8311946: add support for libgraal specific jtreg tests [v5]

[Doug Simon]

On Fri, 14 Jul 2023 06:39:26 GMT, Doug Simon <dnsimon at openjdk.org> wrote:

>> This PR adds support for `jdk.hasLibgraal` and `vm.libgraal.enabled` properties that can be used with the jtreg `@requires` tag to determine if a libgraal specific test should run.
>> 
>> * `jdk.hasLibgraal`: the libgraal shared library file is present
>> * `vm.libgraal.enabled`: libgraal is used as JIT compiler
>
> Doug Simon has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix spelling

Thanks for the reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/14851#issuecomment-1635917931